RADIUS (Remote Authentication Dial-In User Service), Common AAA protocol, centralizes user authentication., TACACS (Terminal Access Controller Access-Control System), Dial-up access control to ARPANET, predecessor of TACACS+., TACACS+, Enhanced TACACS with more response codes, open standard., Kerberos, Network protocol for mutual authentication, prevents replay attacks., SSO with Kerberos, Single authentication, cryptographic tickets, Kerberos-exclusive., Choosing an Authentication Method, Depends on infrastructure, like VPN for RADIUS, Cisco for TACACS+., Multi-Factor Authentication, Requires multiple verification factors, varies in cost..

Comptia A+ core 2 authentication methods

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